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Northport Bridge

Northport Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 20, 2014

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Key Facts

Facility Carried / Feature Intersected
WA-25 Over Columbia River (Franklin D. Roosevelt Lake)
Location
Northport: Stevens County, Washington: United States
Structure Type
Metal Cantilever 18 Panel Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Concrete Curved T-Beam, Fixed
Construction Date and Builder / Engineer
1951 By Builder/Contractor: Midland Structural Steel Company and Engineer/Design: Washington Department of Highways

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
504 Feet (153.62 Meters)
Structure Length
1540 Feet (469.39 Meters)
Roadway Width
24 Feet (7.32 Meters)
Spans
3 Main Span(s) and 12 Approach Span(s)
NBI Number
0003297A0000000

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Historic Structure Reports For This Bridge

View A Historical Article About The Previous Bridge

This bridge is an example of a typical cantilever through truss using a style that the Washington Department of Highways preferred. The distinctive cantilever style differs from those commonly found in other states in that the pointed towers above the roadway are eliminated by locating the extra truss depth required at the piers to below the deck.

Previously at this location was a ferry and a railroad bridge built in 1897 for the Red Mountain Railroad Company. The railroad bridge was later converted for highway use, and used until the bridge deteriorated and was closed on October 5, 1946. It apparently later collapsed. Originally, the bridge was only going to have three t-beam approach spans, but flooding during construction revealed that it would be wise to add five additional t-beam spans. The bridge was built for $1,751,587 and opened on June 13, 1951.

MacRea Brothers were the contractors for the original approach spans and bridge substructure while General Construction Company was the contractor for the added t-beam approach spans and reconstruction of the south main pier which was also damaged by the flood during construction. Midland Structural Steel Company was the superstructure contractor.

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Photo Galleries and Videos: Northport Bridge

 
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CarCam: Northbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.
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CarCam: Southbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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